Help with LVL 78 Ground Slam Marauder Build

Hello Community,

like the topic says, I need help with my LVL78 Ground Slam Marauder.
Its my first endgame char and I think I must have done some mistakes in terms of skilling and equipment. My main attacks are heavy strike(4838dps) and ground slam(3866dps). I have 2558 life, 0 mana and 5328 armour. I am not using any auras or endurance charges atm. My resis are:

fire: 41
cold: 77
lightning: 77
chaos: -20

So MY main critic points are too low life + damage.

Equipment:


Passive Skill Tree:


Thats all I can spend for new equipment:


Please post your suggestions on what I could improve below!
Thank You.

I recomend you using http://www.pathofexile.com/passive-skill-tree/AAAAAgEAAnEEswUtDjwOrQ_MFCAUTRZvGJEY2xkuGYUZ6Ro4HRQhAiFVIWAkiySqJ-0otSkuKaUq9jIJNuk5DjpSPAU9_ECgQT9DnEp9UEdQUFHmVElVqVW1VcZWBFhjWfNbr18_YEtgiGFSZp5nm2egcql07XTxeu97jHy7fNmDOIZgh3aMz49GkFWXtJ65ns2fy5_fogCmZKcwp4SpaKyqrLq0L7ndwBrBBMWKxtjJmM9l0NDUj9w93Q3ewd-_42rkredS7w7vTu988B_yL_Pd9kj3vvrS_MU= this build.

Buy something that gives you mana/mana regen and stop using blood magic. take Arcane Eficiancy
and start using full auras, when your lvl is 90~ take Inner Force for greater buffs

Thats what i'm planing to do on my ground slam marauder. ;)